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science definitions

river basin drainage area of a river
estuary a semi-enclosed area where fresh water from a river meets salt water from the sea
watershed all the land drained by a river, stream or lake
groundwater the water found in cracks and pores in sand, gravel and rocks below the earth's surface
ecosystem a natural system linked by living (plants, animals) and nonliving (soil,air,water) things
Created by: 422367